Question: What Is Spool Command?

Why is spooling used?

Spooling is useful because devices access data at different rates.

The spool buffer provides a waiting station where data can rest while a slower device, such as a printer, catches up.

When the slower device is ready to handle a new job, it can read another batch of information from the spool buffer..

What is Utl_file in Oracle with example?

Definition: In Oracle PL/SQL, UTL_FILE is an Oracle supplied package which is used for file operations (read and write) in conjunction with the underlying operating system. UTL_FILE works for both server and client machine systems. A directory has to be created on the server, which points to the target file.

How do I run a SQL query in Unix?

Do the following steps to start SQL*Plus and connect to the default database:Open a UNIX terminal.At the command-line prompt, enter the SQL*Plus command in the form: $> sqlplus.When prompted, enter your Oracle9i username and password. … SQL*Plus starts and connects to the default database.

What is spooling and can you give an example?

Spooling is the process of sending data to a spool, or temporary storage area in the computer’s memory. This data may contain files or processes. … For example, when you print a document from within an application, the document data is spooled to a temporary storage area while the printer warms up.

How do I run a script in SQL Developer?

sql file as a script in the SQL Developer worksheet. Either use the Run Script icon, or simply press F5 ….A slightly simpler method, though, is to just use drag-and-drop:Click and drag your . … The contents will appear in a “SQL Worksheet”Click “Run Script” button, or hit F5 , to run.

What is a spool file?

Spooling is a system function that saves data in a spooled file for later processing or printing. A spooled file holds output data until it can be printed. … The spooled file collects data from a device until a program or device is able to process the data.

Can we use spool in PL SQL?

If you tried to create such a procedure, you’ll get an error because SPOOL is a SQL*Plus command not a PL/SQL command. Embedding SQL*Plus commands inside a PL/SQL block is not syntactically valid.

How do you spool in SQL?

Using the Oracle spool commandThe “spool” command is used within SQL*Plus to direct the output of any query to a server-side flat file.SQL> spool /tmp/myfile.lst.Becuse the spool command interfaces with the OS layer, the spool command is commonly used within Oracle shell scripts.More items…

What is the difference between spooling and buffering?

Spooling overlaps the input and output of one job with the computation of another job. Buffering on other hand overlaps the input and output of one job with the computation of the same job. Spooling requires less resource management as compare to buffering as different resources manages the process for specific jobs.

What does it mean when your print job is spooling?

Printer spooling enables you to send large document files or a series of them to a printer, without needing to wait until the current task is finished. Think of it as a buffer or cache. It’s a place that your documents can “line up” and get ready to be printed after a previous printing task is completed.

How many tables can you join in SQL?

two tablesIn SQL Server, you can join more than two tables in either of two ways: by using a nested JOIN , or by using a WHERE clause.

How do I use the spool command in SQL Developer?

In order to execute the Spool in Oracle, you’ll need to run it as a script (for example, if you are using Oracle SQL Developer, you may press F5 to run the Spool as a script). Your CSV file will then get created at your specified path.

Can we use spool in procedure?

You can’t use “spool” in a procedure as it is a SQL*Plus command and as Barbara told you for “describe” one in your “how to use desc inside pl sql block?” topic. You have to write yourself in a file using UTL_FILE package.

Where are spool files stored?

Navigate to %SystemRoot%\System32\spool\PRINTERS, on most systems this will be the path C:\Windows\System32\spool\PRINTERS. Delete all flies in this directory.

Can we execute queries parallely from different session?

No, you will need a separate session per query. @Tony is correct, each query must run in it’s own session to run in parallel.

What is Sqlplus command?

SQL*Plus is a command-line tool that provides access to the Oracle RDBMS. SQL*Plus enables you to: Enter SQL*Plus commands to configure the SQL*Plus environment. Startup and shutdown an Oracle database. Connect to an Oracle database.

How do I get more than 5000 rows in SQL Developer?

Click to see full answer. Similarly, it is asked, how do I get more than 5000 rows in SQL Developer? If you are running a script, instead of a statement, you can increase this by selecting Tools/Preferences/Worksheet and increasing “Max Rows to print in a script”. The default is 5000, you can change it to any size.

Where are Oracle spools stored?

Spool is a client activity, not a server one; the . lst file will be created on the machine that SQL Developer is on, not the server where the database it’s connecting to resides. You can spool to a specific directory, e.g. spool c:\windows\temp\test.

How do I set up Serveroutput?

Click on Icon Green Plus and select your schema. Run your sp now. SET SERVEROUTPUT ON; BEGIN FOR rec in (SELECT * FROM EMPLOYEES) LOOP DBMS_OUTPUT. PUT_LINE(rec.